I'm looking for a story that involves magical coins that stop time except for those who touch the coins. A brother and sister find the coins in a box in a pond and they eventually inVolvo a female friend. The friend is in love with the brother. The friend ends up moving in with them because of a bad situation at home.
There was another story that involved time stopping or slowing down for two people who could be siblings or not. At first time stops/slows down for only short periods but then the periods get linger. Then the world around the stops completely. Then one day the girl shows up at her families home with a baby. Time started once the baby was born.